Acropora stn and whitening

[karma]

Hello, it turns out that 2 days ago a friend came on a trip and brought in a croporal damp cloth, some arrived well, when they were put in my tank 2 they bleached, another lost color and one has found that started at the base. Is it the fault of strong lighting? Parameters: Kh 7.7 Nitrate 0.5 PHOSPHATE 0.05 Magnesium 1410. Calcium 450. I already have other Acroporas and colonies but easy ones like the Bonsai and the Pink Lemonade in my year and a half old tank, The new ones are frags.

 

[Gumbies R Us]

Do you have photos?